1,4-Bis{2-hydroxy-3-[N-(2-hydroxyethyl)imino]-5-methylbenzyl}piperazine

Abstract

Key indicatorsSingle-crystal X-ray study T = 293 K Mean '(C±C) = 0.003 A Ê R factor = 0.060 wR factor = 0.190 Data-to-parameter ratio = 20.0 For details of how these key indicators were automatically derived from the article, see

10-[2-(4-Acetylpiperzin-1-yl)ethyl]-9-(4-chlorophenyl)-3,3,6,6-tetramethyl-3,4,6,7,9,10-hexahydro-2H,5H-acridine-1,8-dione

“…The CÐN bond lengths in the B ring are in agreement with values observed for related structures (Gunasekaran et al, 1996;Ganesh et al, 1998;Subbiah Pandi et al, 2001;Jeyakanthan et al, 2000Jeyakanthan et al, , 2002. The average NÐC [1.451 (5) A Ê ] and CÐC [1.489 (6) A Ê ] bond lengths in the piperazine ring agree well with those reported in the literature (Perales et al, 1977;Yogavel et al, 2002). The sum of the bond angles around N10 [359.6 (3) ] and N26 [359.9 (4) ] con®rm the sp 2 hybridization of these atoms; the angles around the atom N23 sum to 333.7 (3) , which is indicative of sp 3 hybridization.…”

“…and C-C [1.489 (6) Å] bond lengths in the piperazine ring agree well with those reported in the literature (Perales et al, 1977;Yogavel et al, 2002). The sum of the bond angles around N10 [359.6 (3)°] and N26 [359.9 (4)°] confirm the sp 2 hybridization of these atoms; the angles around the atom N23 sum to 333.7 (3)°, which is indicative of sp 3 hybridization.…”

3-Hydroxy-2-[4-(2-hydroxyethyl)piperazin-1-ylmethyl]-6-methylpyran-4-one

“…In the piperazine ring, the bond lengths and angles conform to those found previously (Yogavel et al, 2003;Ocak et al, 2004). The piperazine ring adopts a chair conformation, with a total puckering amplitude of Q T = 0.5848 (16) Å (Cremer & Pople, 1975).…”

N,N′-Dibenzoylpiperazine

“…1). The piperazine ring exhibits a chair conformation with the usual bond lengths and angles (Table 1) (Martínez-Martínez et al, 2004;Yogavel et al, 2003). The sum of angles around atom N1 is 360.0 , and the N1-C7 bond length is 1.354 (18) Å , in accordance with the Nsp 2 -Csp 2 amide character [1.355 (14) Å ; Allen et al, 1987].…”